Subtract 81/27 from 12/28
1st number: 12/28, 2nd number: 3 0/27
12/28 - 81/27 is -18/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 27 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 28 × 27 = 756,
12/28 = 12 × 27/28 × 27 = 324/756 - Likewise, for the 2nd fraction, since 27 × 28 = 756,
81/27 = 81 × 28/27 × 28 = 2268/756 - Subtract the two like fractions:
324/756 - 2268/756 = 324 - 2268/756 = -1944/756 - After reducing the fraction, the answer is -18/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28-81/27 12/56-81/27 12/28-81/54 36/28-81/27 12/84-81/27 60/28-81/27 84/28-81/27